JP2008042692A - Communication terminal device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To attain thinning of a casing 1, compared to that of the prior art, in a communication terminal device. <P>SOLUTION: In the communication terminal device, an antenna 3 is mounted to the casing 1 and a feeder 7, provided on a circuit board 2 inside the casing 1, is connected to a terminal part to be fed, of the antenna 3. In the feeder 7 on the circuit board 2, an anisotropic conductive film 8 having conductivity only in the thickness direction is fixed, while bringing its rear side into contact with the feeder 7. Furthermore, a projection 6 is formed to the terminal part to be fed of the antenna 3, and the projection 6 slides, in contact with the front side of the anisotropic conductive film 8. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a communication terminal device such as a mobile phone.

  In the cellular phone, as shown in FIGS. 5 (a) and 5 (b), a rod-shaped antenna (3) is attached to a casing (10) so as to be extendable / shrinkable. A bottom cap (4) and a holder (5) are fixed to the casing (10), and the antenna (3) is slidably penetrated through the central portion thereof.

On the other hand, a circuit board (2) having a power feeding part (7) is arranged inside the casing (10), and a terminal spring (9) attached to the holder (5) contacts the surface of the power feeding part (7). Thus, power is fed from the power feeding section (7) to the antenna (3) through the terminal spring (9) (see Patent Documents 1 and 2).
JP 2005-167650 A (H01Q1 / 24) JP 2000-165126 A (H01Q1 / 27)

  However, in the conventional mobile phone, as shown in FIGS. 5 (a) and 5 (b), the terminal spring (9) is sufficient between the holder (5) and the power feeding section (7) on the circuit board (2). Since it is necessary to exhibit elasticity, there is a problem that the dimension W ′ of the terminal spring (9) in the direction of exerting elasticity increases, and the thickness of the casing (10) increases accordingly.

  Accordingly, an object of the present invention is to make the casing (1) thinner than in the conventional communication terminal device in which the antenna (3) is attached to the casing (1).

In the communication terminal device according to the present invention, the antenna (3) is attached to the casing (1), and the power feeding section (7) provided on the circuit board (2) in the casing (1) is connected to the antenna (3). It is connected to the power supply terminal.
Here, an anisotropic conductive film (8) having conductivity only in the thickness direction is brought into contact with the surface of the power feeding section (7) on the power feeding section (7) on the circuit board (2). On the other hand, a conductive projection (6) is formed on the power-supplied terminal portion of the antenna (3) in sliding contact with the surface of the anisotropic conductive film (8).

  In the above communication terminal device of the present invention, the connection between the power feeding part (7) on the circuit board (2) and the power-supplied terminal part of the antenna (3) is replaced with the conventional terminal spring only in the thickness direction. This is performed by an anisotropic conductive film (8) having conductivity. Here, the anisotropic conductive film (8) itself exhibits elasticity in the thickness direction, and is supplied with power from the power feeding section (7) on the circuit board (2) and the antenna (3) at a plurality of points. Electrical contact is made with the terminal portion, and a stable connection state is realized between the power feeding portion (7) on the circuit board (2) and the power-supplied terminal portion of the antenna (3).

  In a specific configuration, the antenna (3) has a rod shape and is attached to the casing (1) so as to be stretchable / shrinkable. The bottom cap (4) through which the antenna (3) slidably passes is inserted into the casing (1). And the holder (5) are coaxially fixed, and the protrusion (6) is provided on the outer peripheral surface of the holder (5) accommodated in the casing (1).

  In this specific configuration, the protrusion (6) provided on the holder (5) is always connected to the power feeding part (7) on the casing (1) via the anisotropic conductive film (8). Then, power is supplied from the power supply section (7) to the power-supplied terminal section of the antenna (3), that is, the holder (5) through the anisotropic conductive film (8) and the protrusion (6).

  In another specific configuration, the antenna (3) has a rod shape and is attached to the casing (1) so as to be extendable / shrinkable. The antenna (3) reciprocates inside the casing (1) at the base end (31) of the antenna (3). The projection (6) is provided on the circuit board (2) in the casing (1) at a position where the projection (6) faces in the extended state of the antenna (3). 7) is disposed, and a second power feeding portion (71) is disposed at a position where the protrusion (6) faces in the contracted state of the antenna (3). The second power feeding portion (71) includes a second power feeding portion (71). The anisotropic conductive film (81) is fixed with its back surface in contact with the surface of the power feeding section (71).

  In this specific configuration, two power feeding sections (7) (71) are provided on the circuit board (2), and the power feeding sections (7) (71) are arranged in an expanded state and a contracted state of the antenna (3). Can be switched. Here, the protrusion (6) of the antenna (3) is in sliding contact with the anisotropic conductive films (8) and (81) reliably in both the expanded state and the contracted state, and any of the feeding parts (7) and (71) Power is supplied from one of them to the power-supplied terminal portion of the antenna (3), that is, the base end portion (31).

  According to the communication terminal according to the present invention, the anisotropic conductive film replaces the conventional terminal spring in the connection between the feeding portion (7) on the circuit board (2) and the fed terminal portion of the antenna (3). (8), the anisotropic conductive film (8) has an extremely small dimension in the direction of exerting elasticity, that is, the thickness, compared with the terminal spring. ) Can be significantly reduced in thickness.

Hereinafter, embodiments of the present invention in a mobile phone will be described in detail with reference to the drawings.
In the cellular phone according to the present invention, as shown in FIGS. 1 (a) and 1 (b), a rod-shaped antenna (3) is attached to the casing (1) so as to be extendable / shrinkable. At the end of the casing (1), a bottom cap (4) with a built-in antenna coil is fixed through the casing (1), and at the bottom of the bottom cap (4) is a powered terminal portion. A metal holder (5) is fixed. A conductive projection (6) is provided on the outer peripheral surface of the holder (5).

The antenna (3) slidably passes through the center of the bottom cap (4) and the holder (5), and the antenna (3) can be expanded / contracted. Inside the antenna (3), an antenna element (not shown) made of nickel titanium is accommodated.
The antenna element functions as a part of the antenna when the antenna (3) is extended. The antenna coil built in the bottom cap (4) is coupled as the antenna element when the antenna (3) is extended, and functions as a part of the antenna.

  On the other hand, a circuit board (2) having a power feeding part (7) is provided inside the casing (1), and the surface of the power feeding part (7) is covered with a known anisotropic conductive film (8). ing. The anisotropic conductive film (8) is, for example, a porous fluororesin film in which fine through-holes are filled with a conductive metal, and has conductivity only in the thickness direction and appropriate elasticity in the thickness direction. have.

As shown in FIGS. 2 and 3, the protrusion (6) provided on the holder (5) is in sliding contact with the surface of the anisotropic conductive film (8) on the circuit board (2) with an appropriate pressure. It is electrically connected to the power feeding section (7) through the anisotropic conductive film (8).
Here, in the anisotropic conductive film (8), since a large number of conductive portions penetrating in the thickness direction are formed at a fine pitch of about 30 μm, a plurality of points are provided regardless of the sliding contact position of the protrusion (6). In contact with the projection (6), thereby realizing a reliable and stable electrical connection between the projection (6) and the power feeding section (7).

  As shown in FIG. 1 (a), in the mobile phone according to the present invention, the connection between the feeding portion (7) on the circuit board (2) and the holder (5) of the antenna (3) is connected to the conventional terminal spring. Instead, since it is performed by the protrusion (6) and the anisotropic conductive film (8), the dimension W 'in the direction of exerting elasticity of the conventional terminal spring is determined by the height of the protrusion (6) and the anisotropic conductivity in the present invention. This corresponds to the total thickness W of the film (8). Here, the dimension W ′ in the direction of elasticity of the conventional terminal spring was 5.5 mm, for example, whereas the total thickness of the anisotropic conductive film (8) of the present invention and the height of the protrusion (6). Since the value W can be suppressed to, for example, 0.7 mm, the casing (1) can be thinned by 4.8 mm according to the present invention.

In the mobile phone shown in FIGS. 4 (a) and 4 (b), a bottom cap (4) is fixed to the end of the casing (1), and the central portion of the bottom cap (4) is connected to a rod-shaped antenna (3). Is slidably penetrated and can be extended / contracted.
The antenna (3) has a base end portion (31) as a feeding terminal portion, and a metal protrusion (6) is provided on the outer peripheral surface of the base end portion (31).

  On the other hand, a circuit board (2) having power feeding portions (7) and (71) is installed at two locations inside the casing (1), and both power feeding portions (7) and (71) are respectively anisotropically conductive. Covered by films (8) and (81).

  In the extended state of the antenna (3), the protrusion (6) of the antenna (3) is in sliding contact with the first anisotropic conductive film (8) and covered with the anisotropic conductive film (8). Power is fed from the power feeding portion (7) to the base end portion (31) of the antenna (3) through the anisotropic conductive film (8) and the protrusion (6).

  In the contracted state of the antenna (3), the protrusion (6) of the antenna (3) is in sliding contact with the second anisotropic conductive film (81) and covered with the anisotropic conductive film (81). Power is fed from the two power feeding portions (71) to the base end portion (31) of the antenna (3) through the anisotropic conductive film (81) and the protrusion (6).

In this way, the feeding portions (7) and (71) on the circuit board (2) are switched in the stretched / shrinked state of the antenna (3), and appropriate feeding according to the stretched / shrinked state of the antenna (3). Is done.
Here, the protrusion (6) of the antenna (3) is in sliding contact with the anisotropic conductive film (8) (81) at an appropriate pressure in both the extended state and the contracted state, and the sliding contact position of the protrusion (6). Regardless of this, the protrusion (6) and one of the power supply portions are electrically connected at a plurality of points, thereby realizing a reliable and stable electrical connection between the protrusion (6) and the power supply portion.

Similarly in the cellular phone, the total value W of the thickness of the anisotropic conductive films (8) and (81) and the height of the protrusions (6) can be suppressed to, for example, 0.7 mm. A significant reduction in thickness is possible.
In addition, according to the cellular phone, the anisotropic conductive films (8) and (81) exhibit elasticity over a longer period than the conventional terminal spring and maintain a reliable electrical connection state. Therefore, the power supply to the antenna (3) does not become unstable by frequent switching.

It is sectional drawing which shows the antenna expansion | extension state and contraction state of the mobile telephone which concerns on this invention. It is an enlarged side view which shows the connection state of the protrusion by an anisotropic conductive film, and a electric power feeding part. It is an enlarged front view which shows the connection state of the protrusion by an anisotropic conductive film, and a electric power feeding part. It is sectional drawing which shows the antenna expansion | extension state and shrinkage | contraction state of the other mobile telephone based on this invention. It is sectional drawing which shows the antenna expansion | extension state and shrinkage | contraction state of the conventional mobile phone.

Explanation of symbols

(1) Casing
(2) Circuit board
(3) Antenna
(4) Bottom cap
(5) Holder
(6) Protrusions
(7) Feeder
(71) Feeder
(8) Anisotropic conductive film
(81) Anisotropic conductive film

Claims (3)

  A communication terminal in which an antenna (3) is attached to a casing (1), and a power feeding section (7) provided on a circuit board (2) in the casing (1) is connected to a power-supplied terminal section of the antenna (3). In the apparatus, an anisotropic conductive film (8) having conductivity only in the thickness direction is brought into contact with the surface of the power feeding section (7) on the power feeding section (7) on the circuit board (2). On the other hand, a conductive protrusion (6) is formed on the power-supplied terminal portion of the antenna (3) so as to be in sliding contact with the surface of the anisotropic conductive film (8). Terminal device.   The antenna (3) has a rod shape and is attached to the casing (1) so as to be stretchable / shrinkable. The casing (1) has a bottom cap (4) and a holder (5) through which the antenna (3) is slidable. 2. The communication terminal device according to claim 1, wherein the projections (6) are provided on an outer peripheral surface of a holder (5) which is fixed on the same axis and is accommodated inside the casing (1).   The antenna (3) has a rod shape and is attached to the casing (1) so as to be extendable / shrinkable. The protrusion (6) is formed at the base end (31) of the antenna (3) that reciprocates inside the casing (1). On the circuit board (2) in the casing (1), the feeding portion (7) is disposed at a position where the protrusion (6) faces in the extended state of the antenna (3). The second feeding portion (71) is disposed at a position where the protrusion (6) faces in the contracted state of the antenna (3). The feeding portion (71) has a second anisotropic conductive film ( The communication terminal device according to claim 1, wherein 81) is fixed with its back surface in contact with the surface of said power feeding section (71).

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